Thermal Group "BIG BORE" 75cc Pin From 12

The Pinasco " EVOTEN BIG BORE " Ø 46mm cylinder kit is a new product dedicated to the world of Piaggio mopeds. Compared to the previous model, it has 2 new recalculated main transfer ports and 4 new piston-port transfer ports, the exhaust has been further enlarged to significantly increase performance and to house the 22, 25 and 28mm flanged exhaust manifolds. The Pinasco " EVOTEN BIG BORE " thermal unit is supplied with the new central unified spark plug head with 5 studs fixed to the recess and complete with decompression valve which definitively eliminates the problem of vents in the combustion chamber and the consequent loss of performance; the compression ratio is 13: 1